Not to be confrontational, but "people" will lie to you as will many other species of animal. If you don't trust scientists or professors specifically, do you just bang rocks together for your internet, or are you maybe trusting millions of man-years of accumulated actual science to deliver my words to your eyes?
So I take issue that "all" of us will lie to you. Whatcha studying 25 years of your life for Tommy? I wanna lie to people momma! I would bet there might be slightly many more politicians or mechanics that might bend the truth (it's also a much easier credentialing process). IF we are gonna pick on professions. Shall we pick religious affiliation and hair color too? Because not "all" of anything do anything and you can cut all stinking lying humans into any subpopulation.
Don't be so jaded against a group dude. It's pretty hard to find a more consistently positive force in human history (ok not the guy that invented freon AND put lead in gasoline) but it's a pretty good batting average. Even lead-in-gas guy was forced to lie by his employer. On the other hand, all old lady's will lie if they get busted farting in church, lol! Just food for thought bro, don't take it as me coming down on you please.